| 摘要 |
PURPOSE:To correct the unbalance of an electromagnetic clutch motor before by calculating previously the density difference occurred at the casting time and providing a recess on an area in which the density difference occurs. CONSTITUTION:Recesses 22 are formed in advance on areas 6, 7 in which the density increases in an inlet. The size and depth of the recess 22 are determined by casting without recess 22 and measuring the density in response to the unbalacing amount. An inertial unit cast without recess 22 is corrected for the unbalance, and readily calculated by the unbalance correcting amount opened to correct the vicinities of the areas 6, 7. As described, the area which increases in the density due to the relation of the inlet of the casting mold is presumed, and the unbalance of the recess is corrected in advance at the casting time, thereby eliminating the unbalance correction after working.
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